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Texas Instruments ADS131B23PHPR
- Part No.:
- ADS131B23PHPR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TQFP Exposed Pad
- Datasheet:
-
ADS131B23PHPR.pdf
- Description:
- 24-BIT, 64-KSPS, THREE-CHANNEL S
- Quantity:
- Payment:
- Shipping:
Inventory:977
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Product details
Overview
ADS131B23PHPR from Texas Instruments is a high-voltage, 3-channel battery-pack monitor IC for industrial and automotive BMS applications. It integrates two simultaneous-sampling 24-bit ADCs (ADC1A/ADC1B) for precision current-shunt measurement with ±1.5μV max offset error and 20ppm/°C gain drift, plus one 16-bit multiplexed ADC (ADC2A) for voltage and temperature sensing across eight analog inputs. It operates from 2.9V to 16V supply and delivers fast overcurrent detection via dual digital comparators.
For engineers reviewing the ADS131B23PHPR datasheet, ADS131B23PHPR pinout, ADS131B23PHPR application, or ADS131B23PHPR equivalent, this device supports critical functional safety requirements in high-voltage battery monitoring-including diagnostic clock watchdogs, supply voltage monitors, CRC-protected register maps, and open-wire detection-making it suitable for ASIL-B–capable BMS designs.
Technical Context
The ADS131B23PHPR implements a dual-path analog front-end: ADC1A and ADC1B operate simultaneously at up to 64kSPS with programmable gains (4–32×) and independent digital overcurrent comparators, enabling redundant current measurement per shunt resistor. ADC2A uses a channel sequencer to scan eight analog inputs at 16-bit resolution with programmable full-scale ranges (±312.5mV to ±1.25V), supporting thermistor-based temperature and high-voltage pack voltage sensing via external dividers.
It features dual internal oscillators (8.192MHz main and diagnostic clocks), hardware-level fault detection including AVDD/IOVDD/DVDD supply monitoring (UV/OV/oscillation/OTW), memory map and register map CRC validation, and GPIO-driven FAULT signaling with sub-5µs response for critical events like DGND/AGNDy open detection or MCLK failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit (ADC1A/ADC1B), 16-bit (ADC2A); enables <100nΩ shunt resolution and <0.1°C thermistor accuracy. |
| Data Rate Range | 500 SPS to 64 kSPS; supports both slow thermal tracking and fast transient overcurrent capture. |
| Offset Error (ADC1) | ±1.5 μV (max); ensures <0.01% full-scale error at ±39mV range, critical for low-current battery state-of-charge estimation. |
| Gain Drift (ADC1) | 20 ppm/°C (max); maintains calibration stability across –40°C to +105°C automotive operating range. |
| Reference Voltage | 1.25 V (REFA/REFB), ±0.15% initial accuracy, 3–15 ppm/°C drift; provides stable scaling for all ADC channels and comparators. |
| Supply Voltage Range | 2.9 V to 16 V (APWR/DPWR); allows direct connection to unregulated HV battery rails without external DC/DC pre-regulation. |
| Fault Detection Latency | 2 µs (clock watchdog), 4 µs (supply UV/OV/open-detect), 300 µs (overtemperature warning); meets ISO 26262 ASIL-B timing constraints. |
Pinout & Package
ADS131B23PHPR is housed in a 48-pin HTQFP (PHP) package with 9mm × 9mm footprint and exposed thermal pad connected to AGND. Pin functions are electrically segregated into analog (AGNDA/AGNDB, CPA/CNB, V0A–V7A), digital (CSn, SCLK, SDO, DRDYn), power (APWR, DPWR, AVDD, IOVDD), and GPIO domains (GPIO0A–GPIO4/OCCB), with dedicated reference outputs (RCAPA/RCAPB) and fault signaling (GPIO2/FAULT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPA / CNB | ADC1A positive / ADC1B negative input | Differential current-shunt sensing inputs with 1.8MΩ input impedance; referenced to AGNDA/AGNDB for noise isolation. |
| V0A–V7A | ADC2A multiplexed analog inputs | Eight single-ended inputs supporting thermistor, NTC, or high-voltage divider networks; sequenced automatically to reduce SPI overhead. |
| GPIO3/OCCA / GPIO4/OCCB | Digital overcurrent comparator outputs | Push-pull outputs asserting active-low on threshold violation; enable hardware-fast shutdown without MCU intervention. |
| DRDYn | Data-ready indicator | Active-low signal synchronized to conversion completion; used to trigger SPI read without polling or fixed delays. |
| RCAPA / RCAPB | Reference voltage outputs | 1.25V precision references with 250µA source capability; decoupled with 1µF capacitors to AGNDA/AGNDB for ADC stability. |
| GPIO2/FAULT | Aggregate fault output | Open-drain or push-pull (configurable) output that latches on any detected hardware fault (supply, clock, memory, open-wire). |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous 24-bit ADCs | Enables redundant, time-aligned current measurement across two shunts-critical for fault-tolerant BMS architectures. |
| Programmable ADC data rate (500SPS–64kSPS) | Allows dynamic trade-off between noise performance (low SPS) and transient response (high SPS) without firmware reconfiguration. |
| Integrated supply & clock monitors | Detects AVDD/IOVDD/DVDD UV/OV/oscillation/overtemperature within 4–300 µs, satisfying ASIL-B diagnostic coverage requirements. |
| Memory and register map CRC protection | Prevents silent data corruption in configuration registers and memory-mapped diagnostics; validated at runtime with <138 µs fault latency. |
| Open-wire detection (OWD1A/OWD1B/OWD2A) | Configurable 4/40/240 µA current sources/sinks verify sensor connectivity before measurement-eliminates false readings from broken wires. |
| 9 GPIOs with PWM capability | Supports auxiliary control (e.g., precharge FET gating, fan speed, LED status) and reduces need for external logic in compact BMS modules. |
Applications
| Battery Energy Storage System (ESS) Monitoring | Electric Vehicle Traction Battery Pack |
|---|---|
Use Scenario: Real-time monitoring of large-format Li-ion or LFP battery stacks in grid-scale ESS cabinets. IC Role / Device Role / Timing Role: Primary high-voltage analog front-end performing simultaneous current, pack voltage, and cell-group temperature acquisition. Use Value: Enables accurate state-of-charge (SoC) and state-of-health (SoH) estimation using 24-bit current resolution and 16-bit multi-point voltage/temperature correlation. |
Use Scenario: Safety-critical current and voltage monitoring in 400V–800V EV traction battery packs with redundancy requirements. IC Role / Device Role / Timing Role: Functional safety–oriented BMS monitor providing ASIL-B–compliant diagnostics, dual ADC redundancy, and sub-5µs fault signaling. Use Value: Meets ISO 26262 requirements through integrated clock watchdogs, supply monitors, CRC-protected memory, and deterministic fault response timing. |
| Industrial UPS Battery Management | Renewable Energy Storage Rack |
Use Scenario: Continuous health monitoring of lead-acid or LiFePO₄ backup batteries in telecom/datacenter UPS systems. IC Role / Device Role / Timing Role: High-accuracy current integration and voltage trending engine with built-in open-wire detection for maintenance-free operation. Use Value: Detects degraded interconnects or failing cells early via OWD and long-term drift compensation, reducing unplanned downtime. |
Use Scenario: Modular battery rack monitoring in solar+storage installations with distributed voltage and temperature sensing. IC Role / Device Role / Timing Role: Centralized analog acquisition unit interfacing with multiple thermistors and HV resistor dividers across parallel battery strings. Use Value: ADC2A's 8-input sequencer reduces wiring complexity and SPI traffic while maintaining synchronized sampling across string-level parameters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-pack monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS131B26PHPR | Four 24-bit ADC channels (vs. three total), adds second 16-bit ADC (ADC2B); identical fault diagnostics and package. | Supports higher channel count BMS with dual shunt + dual voltage/temperature groups; requires additional PCB routing for extra analog inputs. | Select when monitoring >2 current paths or requiring independent ADC2B sequencing for isolated subsystems. |
| AD7280AWBSTZ-RL | 6-channel 12-bit SAR ADC with daisy-chain SPI; no integrated overcurrent comparators, lower resolution, no supply/clock watchdogs. | Lacks functional safety features and 24-bit precision; suited for cost-sensitive, non-ASIL applications with simpler diagnostics. | Choose only for legacy or non-safety-critical BMS where 12-bit resolution and absence of CRC/fault monitors are acceptable. |
Compared with ADS131B23PHPR, ADS131B26PHPR extends channel count while preserving safety architecture, whereas AD7280AWBSTZ-RL offers lower-cost, lower-resolution monitoring without ASIL-B support-making ADS131B23PHPR the optimal balance of precision, safety, and integration for mid-tier industrial and automotive BMS.
Availability
ADS131B23PHPR is available at Aetrix Electronics and suitable for battery energy storage systems (ESS), electric vehicle (EV) traction battery packs, and industrial uninterruptible power supplies (UPS) requiring stable component supply, long-term lifecycle support, and ASIL-B–ready analog monitoring.
Supply support for ADS131B23PHPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and automotive-grade ICs.
The ADS131B23PHPR belongs to TI's high-voltage battery monitor product line, designed specifically for functional safety–compliant BMS in electric vehicles and grid-scale energy storage-emphasizing redundancy, real-time fault detection, and wide-input-range operation.
FAQ
What is the maximum operating voltage for ADS131B23PHPR analog inputs?
The ADS131B23PHPR supports analog input voltages from AGND – 1.6 V to AVDD + 0.3 V per the Absolute Maximum Ratings table. For ADC1A/ADC1B, the differential input range is ±VREFy/Gain, with VREFy = 1.25 V and gain settings of 4–32×, yielding usable differential spans from ±39 mV to ±312.5 mV. This enables precise current sensing across diverse shunt resistor values without external amplification.
Does ADS131B23PHPR support functional safety certification out of the box?
The ADS131B23PHPR includes hardware-level safety mechanisms required for ASIL-B compliance-including dual clock monitoring (MCLK/OSCD watchdogs), supply voltage monitors (UV/OV/oscillation/OTW), memory and register map CRC, open-wire detection, and sub-5 µs fault signaling-but does not carry formal ISO 26262 certification. Customers must validate system-level compliance using TI's safety manual and FMEDA report for ADS131B23PHPR.
How many analog inputs does ADS131B23PHPR support for voltage and temperature sensing?
The ADS131B23PHPR supports eight analog inputs (V0A–V7A) for voltage and temperature sensing via its multiplexed 16-bit ADC2A. These inputs can be configured in sequence using the built-in channel sequencer, allowing automatic scanning without continuous SPI command overhead-ideal for thermistor arrays or multi-point HV divider networks in battery packs.
Can ADS131B23PHPR operate without an external crystal or clock source?
Yes, ADS131B23PHPR integrates an internal 8.192 MHz main oscillator (OSCM) and diagnostic oscillator (OSCD), both with ±2.5% accuracy. External clocking is optional and only required when tighter frequency stability than ±2.5% is needed. The internal oscillators enable full functionality-including ADC conversion, SPI communication, and fault monitoring-without external components.
What GPIO capabilities does ADS131B23PHPR provide beyond basic I/O?
ADS131B23PHPR provides nine GPIOs, four of which (GPIO0A, GPIO1A, GPIO0B, GPIO1B) are referenced to AVDD for analog-domain interfacing, while others (GPIO0/MHD, GPIO1, GPIO2/FAULT, GPIO3/OCCA, GPIO4/OCCB) are IOVDD-referenced. All support PWM output, and GPIO2/FAULT, GPIO3/OCCA, and GPIO4/OCCB serve dual roles as configurable fault and overcurrent comparator outputs with push-pull or open-drain drive options.
ADS131B23PHPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 64k
- Number of Inputs:
- 8
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- 0:3
- Number of A/D Converters:
- 3
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 2.9V ~ 3.6V, 4V ~ 16V
- Voltage - Supply, Digital:
- 2.9V ~ 5.5V, 4V ~ 16V
- Features:
- Internal Oscillator, PGA, Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 48-HTQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS131B23PHPR FAQ
1.How can I place an order for ADS131B23PHPR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS131B23PHPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS131B23PHPR reliable?
The price and inventory of ADS131B23PHPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS131B23PHPR is usually 5 days.
3.What payment methods are accepted for ADS131B23PHPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS131B23PHPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS131B23PHPR?
ADS131B23PHPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS131B23PHPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS131B23PHPR?
For technical support, including ADS131B23PHPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS131B23PHPR requirements.
6.How does Aetrix verify that ADS131B23PHPR is sourced from the original manufacturer or authorized distributors?
All ADS131B23PHPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS131B23PHPR meets industry standards.
7.What is the process for return or replacement of ADS131B23PHPR?
All ADS131B23PHPR units undergo pre-shipment inspection (PSI). If there is an issue with ADS131B23PHPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS131B23PHPR part is unused and in its original packaging.
Return procedure for ADS131B23PHPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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